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Chemical Name: Manganese(0) carbonyl
SYNONYMS: Manganese pentacarbonyl
Formula: Mn(CO)5
Physical Form: Yellow to orange solid, sometimes found as crystals
Odor: Not distinctly strong, but do not rely on smell for safety
Typical Uses: Catalyst in organic chemistry, intermediate for fine chemicals
Risk Context: Used mainly in labs or research settings, rare in production plants
Main Risks: Inhalation can irritate the lungs and cause dizziness, coughing, or headaches; skin exposure risks irritation or burns; eyes react with immediate pain on contact
Fire Hazard: Reacts to heat or flame, risk of carbon monoxide release
Toxicity: Decomposes to dangerous gases including carbon monoxide, which is a silent and deadly threat
Environmental Impact: Not just a human health worry, aquatic systems feel the effects since decomposition byproducts harm wildlife
Chronic Exposure: Extended or repeated exposure brings risk of manganese poisoning, bringing neurological symptoms in worst cases
Purity: Usually sold as near-pure compound for lab work
Hazard Components: Manganese(0) carbonyl is the active toxic ingredient, not a mixture
Impurities: May include traces of other transition metals or decomposition products depending on storage, but these have less influence on acute toxicity than the main compound
Inhalation: Quickly get the person to fresh air, avoid mouth-to-mouth if carbon monoxide suspected, use barrier device
Skin Contact: Wash thoroughly with soap and water, remove any tainted clothing quickly
Eye Contact: Rinse eyes gently with plenty of water, continue rinsing even if it stings
Ingestion: Get medical help, do not induce vomiting because it makes things worse; rinse mouth if person is awake
Medical Attention: Call for professional help as soon as possible for any significant contact, since symptoms get worse with time if not treated
Suitable Extinguishing Media: Dry powder or carbon dioxide for small fires; do not use water directly
Hazardous Combustion: Burns to produce toxic vapors, so protective gear and breathing apparatus stay necessary
Attention Points: Removing containers from area if safe protects responders, keeping away from heat limits escalation
Protective Actions: Firefighters need chemical-resistant boots and gloves
Personal Protection: Wear gloves, goggles, and lab coat or chemical suit
Ventilation: Work in a hood prevents inhalation of vapors
Spill Response: Sweep up with non-sparking tools, avoid creating dust, store waste in sealed container
Cleaning: Wash surfaces thoroughly, monitor air for toxic vapors before allowing normal work to resume
Access Control: Keep unnecessary people out; only those trained in hazardous materials response handle clean-up
Storage: Keep tightly sealed in a cool, dry cabinet, locked when not in use, away from light and heat
Handling: Only trained staff in well-ventilated areas using tools, not bare hands
Organizational Controls: Keep logs and inventories for accountability and safe rotation
Segregation: Store apart from acids, strong oxidizers, and foods
Engineering Controls: Fume hood or local exhaust to keep air clear
Personal Protective Equipment: Gloves (nitrile or better), fitted goggles, face shield for high-risk operations; lab coat or chemical suit
Respiratory Protection: If ventilation fails, use approved respirator with organic vapor cartridge
Hygiene Measures: Wash hands after handling, do not eat or drink nearby, change out of contaminated gear before leaving the lab
Monitoring: Routine air checks for carbon monoxide and manganese levels
Appearance: Yellow to orange solid, sometimes crystalline
Melting Point: Low, but exact figure depends on batch
Boiling Point: Decomposes before boiling
Solubility: Poor in water, soluble in organic solvents
Odor Threshold: Not reliable for safety
Vapor Pressure: Notable, risk of inhalation exists even at room temperature
Stability: Stable only under controlled conditions, sensitive to air and light
Reactivity: Reacts violently with acids or oxidizers
Decomposition: Yields carbon monoxide and manganese oxides, both hazardous
Polymerization: Not reported, but slow degradation creates risk over time
Incompatible Materials: Acids, halogens, strong oxidizers
Acute Toxicity: Inhalation risks are high, especially in closed rooms
Skin Effects: Absorption through skin isn’t rapid, but enough can cause burns or systemic effects
Eye Effects: Contact causes immediate pain and injury
Chronic Effects: Repeated exposure can trigger symptoms of manganese toxicity—tremors, memory changes, or even movement disorders
Other Routes: Ingestion rarely occurs but is highly dangerous
Toxicity to Aquatic Life: Manganese(0) carbonyl and its breakdown products threaten fish and invertebrates
Bioaccumulation: Manganese tends to settle in sediments, which in turn affects the food chain
Persistence: Does not degrade quickly; stays for years in certain environmental niches
Spread: Leaching from waste or spills finds its way into drains, highlighting need for specialized disposal
Containment: Store solid and liquid waste in sealed, labeled containers
Method: Ship to hazardous waste incinerators or chemical disposal specialists; never treat as regular waste
Spill Residues: Anything used to absorb or sweep up must go for hazardous waste processing
Environmental Checks: Avoid pouring down the drain, test for residual contamination before closing out clean-up
UN Number: Not carried by standard shippers, subject to local restrictions
Packing Group: Treated as highly hazardous for lab moves
Label Requirements: Clear toxic, irritant, and environmental danger labels on all packages
Container Recommendations: Use shatterproof, chemical-resistant bottles, and strong secondary containment
Workplace Exposure Limits: No universal safe threshold, agencies set strict limits
Hazard Classification: Labeled as toxic and environmentally hazardous by most national and international agencies
Handling Laws: Only trained, documented personnel may access in many regions
Disposal Regulations: Strong rules on incineration or chemical treatment of waste, with heavy penalties for neglect
Safety Data Requirement: Up-to-date documentation expected for legal compliance, regular audits part of most labs' routine
